At that age, we tend to be a bit more naive than later in life. This does not make it excusable for the things she did. At age 12 and above, you start to learn that even words can be very hurtful. So if you do shit like her 10 years later, something is off very badly.

That being said, we all learn and from my personal experience, a pregnancy can change people drastically. So I really hope for her and her son, that she moves on and does better in the future.